JPH05108834A - Graph character string and leader line plotting system - Google Patents

Abstract

PURPOSE:To prevent the display of each item from being swelled out from a screen by calculating the writing position of each character string, and shifting the writing position of one character string at the time of judging that two character strings are overlapped. CONSTITUTION:The writing position of the character string of each time of a graph is calculated before plotting, and the leader of one character string is extended when the character strings are overlapped, so that the character strings can be prevented from being overlapped. And also, when an another character string is overlapped due to the pertinent prevention, the similar preventing processing is successively operated, and this is repeated until the entire character strings can not be overlapped on plotting. And also, when the display range of the entire graph including the character strings is judged to be beyond a plotting area, the reduction ratio of the entire graphic is calculated, and the entire graph is reduced, so that the graph can be plotted within the plotting area. Thus, the visibility of the graph can be improved, and the display of each item can be prevented from being swelled out from the screen by plotting the graph within a restricted display frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graph character string / leader line drawing system, and more particularly to a system for writing a character string such as characters / symbols corresponding to each item when drawing a graph.

[0002]

2. Description of the Related Art A conventional character string / drawing line drawing system for a graph will be described with reference to the drawings.

FIG. 5 is a diagram showing an example of drawing by a character string / leader line drawing method of a conventional graph.

Conventionally, when drawing a character string or a leader line corresponding to each item of a pie chart, as shown in FIG. 5, a character string is drawn at a location radially apart from each item of the pie chart by a certain length. is doing. In that case, it may be drawn such that each item of the pie chart and the character string are connected by a leader line of a constant length.

[0005]

In the above-mentioned conventional character string / drawing line drawing method for pie charts, when items having a small ratio to the whole pie chart continue, the character strings corresponding to the respective items overlap and cannot be recognized. Or there is a problem that it becomes difficult to recognize. Further, if the leader line is made uniformly long in order to avoid overlapping of character strings, there is a problem that the item name display will be out of the screen and drawing will not be possible.

An object of the present invention is to solve the above drawbacks, calculate the writing position (display position) of the character string of each item of the graph before drawing, and if the character strings overlap, draw one of the leader lines. By stretching, it avoids that the character strings do not overlap. If another character string overlaps due to this avoidance, the same avoidance process is sequentially performed, and this is repeated until all character strings do not overlap in drawing, and the entire graph including the character string is displayed. When it is determined that the range exceeds the drawing area, the reduction ratio of the entire graph is calculated, the entire graph is reduced, and the graph is drawn in the drawing area so that the character strings surrounding the graph do not overlap. By increasing the visibility of the graph and drawing the graph in the restricted display frame, the item name display can be prevented from protruding from the screen, and the usability can be improved. It is to provide a column / leader line drawing method.

[0007]

In the character string / drawer line drawing method of the graph of the first invention, a character string consisting of an item name, a numerical value and a symbol corresponding to each item is provided in the vicinity of each item of the graph. In the graph character string writing method that connects each item of the graph and each character string with a leader line, calculate the writing position of each character string, and if it is determined that two character strings overlap, The writing position is shifted.

In the character string / leader line drawing method of the graph of the second invention, in the character string / leader line drawing method of the graph of the first invention, in the case of a pie chart, each item of the pie chart occupies A point on the bisector of the corner is a leader line start point, a point at a certain distance outside the radial line circle from the leader line start point is a leader line temporary end point, and a straight line connecting the leader line start point and the leader line temporary end point is a temporary leader line. After defining each, calculate the angle of the temporary leader line of each item of the pie chart from the pie chart base line to calculate the coordinate position of the temporary leader line end point, and the two adjacent character strings starting from this will overlap each other. Otherwise, the coordinate position is set as the leader line end point, and when it is determined that they overlap each other, the coordinate position of the starting point of one of the character strings determined by the quadrant in which the two character strings are arranged is corrected, and this correction is performed. It is plotted the lead lines and string coordinate position as lead line end point.

The character string / leader line drawing method of the graph of the third invention is the arrangement of any one of two character strings in the character string / leader line drawing method of the graph of the second invention. When it is determined that the corrected character string overlaps with another character string by correcting the position, the display position is further corrected for the overlapped character string. The column display position is being corrected.

In the character string / leader line drawing method for a graph according to the fourth aspect of the present invention, it is determined whether or not a graph including a character string exceeds a screen drawing area capable of being displayed, and the entire graph including the character string is displayed on the display device. If it is judged that the screen drawing area is exceeded,
Calculate the reduction ratio for reducing the entire graph including the character string to the size that can be displayed in the display device screen drawing area, and multiply the reduction ratio by all the display position coordinates of the graph to be reduced. After obtaining the new display position, the leader line and the character string are drawn.

[0011]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a flow chart of an operation process for creating a pie chart by a character string / leader line drawing method of a graph according to an embodiment of the present invention, FIG. 2 is a diagram showing a drawing area by the method of FIG. 1, and FIG. Diagram showing the general form of drawing by the method of FIG. 1,
FIG. 4 is a diagram showing an example of drawing by the method of FIG. First,
The operation of creating a pie chart according to this embodiment will be described with reference to FIGS. 1 and 2.

In FIG. 1, step 1 for inputting drawing data
Then, enter a finite record consisting of two fields, a character string and a numerical value. In the angle calculation step 2, the percentage and angle occupied by each item are calculated from the drawing data input step 1. In the display circle angle calculation step 3, the accumulated angle is calculated based on the information from the angle in the angle calculation step 2. In the character string display height calculation step 4, the height of the character string display is calculated based on the information from the display circle angle calculation step 3. In the character string display position determination step 5, as shown in FIG. 2, the character string display height calculation step 4 is performed in the order of the first quadrant, the fourth quadrant, the third quadrant, and the second quadrant in which the drawing area is determined.
When the character strings of the adjacent items are present in only one of the left and right half of the circle, it is judged whether the character strings overlap based on the difference in the height of the character string display of the adjacent items. .

In the character string display position correcting step 6, if the character strings overlap according to the information in the character string display position determining step 5, the height correction and the horizontal display position correction are performed so that adjacent character strings do not overlap. To determine the coordinates of the end point of the leader line.

In the character string correction step 7, a percentage and a percent symbol are added to the record of the drawing data input step 1. In the character string drawing position calculation step 8, from the line segment in the positive direction of the y-axis, the nth character string in the pie chart (hereinafter, character string M
_(n) and Write) determine drawn from the magnitude of the angle theta _n up to the bisector of the fan-shaped corners occupied by the string M _(n) of the string on the right half side or the left half side of the pie However, if it is determined to draw on the left side, the position at the horizontal distance of the character string length from the end of the leader line is the character string drawing start point,
When it is determined to draw on the right side, the leader line end point is set as the character string drawing start point. In the character string display frame determination step 9,
Judge whether the restricted display frame of the pie chart is larger than the area occupied by the pie chart. In the reduction rate calculation step 10, the reduction rate of the pie chart is calculated based on the information in the character string display frame determination step 9, and the character string display position calculated after the character string display height calculation step 4 is multiplied by the reduction rate. Calculate again. In the drawing line drawing step 11, a drawing line connecting the drawing line starting point on the circumference to the drawing line end point corrected in the character string display position correcting step 6 is drawn. In the character string drawing step 12, the character string is drawn based on the information from the character string drawing position calculating step 8.

Next, a calculation method for creating a pie chart according to this embodiment will be described in detail with reference to FIG.

The circle origin O, the x axis and the y axis are defined as shown in FIG.

In the character string display height calculation step 4, calculation is performed in the following procedure.

Let H (= constant) be the unique height of the character string and r be the radius of the pie chart.

2 of the occupation angle of the character string (item) of the pie chart
Bisectrix a distance from the center of A _n [pie point which is a predetermined distance d in the radially inward from the intersection B _n of the pie arc (r
-D)]], and a point at a constant distance radially outward from the point B _n (at a distance r ₁ from the origin O of the circle graph) from the point B _{n, the} temporary end point C _n ( Mx
_n , My _n ), and the straight lines connecting the points A _n and C _n are defined as provisional leader lines, respectively. When the character string display position is not corrected, the distance from the point O to the temporary leader line end point C _n of the character string M _n is (r + dr), so the coordinates of the point C _n (M
x _n , My _n ) can be obtained as follows.

[0021]

Therefore, Mx_n= (R + dr) sin θ_n  My_n= (R + dr) cos θ_n  In the character string display position determination step 5, the character string M_n
Point C which is the display position of_nAnd the string M_(n-1)At the display position of
Some point C_n-1Whether the character strings overlap by comparing the y-coordinates of
To judge.

The conditional expression at this time can be expressed by the following expression.

Character string height difference: Δh_n  Δh_n= My_n-My_n-1 = (R + dr) cos θ_n− (R + dr) cos θ_n-1  = (R + dr) (cos θ_n-Cos
θ_n-1) In the above formula, it is judged that the character strings overlap in the following four cases:
To do.

(1) In the first quadrant or the fourth quadrant, -H <
When Δh _n <0 (2) In the second or third quadrant, when 0 <Δh _n <H (3) In the first or fourth quadrant, and when Δh _n > 0 (4) Second quadrant Alternatively, in the third quadrant, when Δh _n <0, (3) and (4) may occur when the display position correcting work occurs.

When judging the character strings after the _first character string M ₍₁₎ , the points D ₁ to D _n are respectively set to the points C ₁ to C _n and the overlapping of the character strings is judged in the same manner as above. To do.

When it is determined in the character string display position determination step 5 that adjacent character strings do not overlap, the temporary leader line end point C _n is set as the leader line end point D _n .

The case where it is determined that the character strings overlap will be described below.

In the character string display position correcting step 6, the correction procedure is as follows: in the first quadrant or the third quadrant, the character string M
_(n-1) The leader line tentative end point C _{n-1 is} modified to newly calculate the leader line end point D _n-1 , and then this point D _n-1 and point C _n-2 are calculated. If it is determined that the character strings overlap each other by comparison, the display position of the character string M _(n-2) is also corrected, and so on. Make corrections to the string. Also,
In the case of the second quadrant or the fourth quadrant, the leader line temporary end point C _n of the character string M _(n) is corrected to newly calculate the leader line end point D _n .

Next, the correction method when the criterion for judging that the character strings overlap is (1) or (2) of the character string display position judging step 5 is shown below.

The correction value in the y-axis direction at the end of the leader line is Δy_n
Then, the first quadrant: Δy_n= H + Δh_n Second quadrant: Δy
_n= H-Δh_n  Third quadrant: Δy_n= -H + Δh_n Fourth quadrant:
Δy_n= -H-Δh_n  Can be expressed as

In the first and third quadrants, the character string M
_(n-1)I am going to correct_n-1= My_n-1+ Δy_n  And the character string M in the second and fourth quadrants._(n)Nitsu
I will correct it, so MY_n= My_n+ Δy_n  Can be expressed as Character string M_(n)Δx is the horizontal correction of_nWhen
Then, it can be expressed by the following equation.

[0033]

Character string M_(n)After the correction of the character string display position
Point D_n(MX_n, MY_n), The character string M_(n-1)After the correction of
Character string display position is point D_n-1(MX_n-1, MY_n-1)
Then, in the first and third quadrants, the character string M_(n-1)Nitsu
I will correct it, so MX_n-1= Mx_n-1+ Δx_n  And the character string M in the second and fourth quadrants._(n)Nitsu
I will correct it, so MX_n = Mx_n+ Δx_n  Can be expressed as In this way, the character string M_(n)Or string
M_(n-1)Obtained by modifying the temporary leader line end point C of
Coordinates (MX_n, MY_n) Or coordinates (MX_n-1, M
Y_n-1) Are newly added as coordinates (Mx_n, My_n)Also
Is (Mx_n-1, My_n-1) And the end of the new leader line
D_nOr D_n-1And

The correction method when the criterion for judging that the character strings are overlapped is (3) or (4) of the character string display position judging step 5 will be shown below. First quadrant: MY _n-1 = My _n + H Second quadrant: MY _n
= My _n-1 -H 3rd quadrant: MY _n-1 = My _n -H 4th quadrant: MY _n
= My _n-1 + H, then My (MY) is calculated, and then Mx (MX) is calculated to calculate the corrected position. In the case where another character string is newly overlapped by the above correction method, the above correction work is further performed.

When the character string in the first quadrant and the character string in the fourth quadrant and the character string in the second quadrant and the character string in the third quadrant overlap each other, the character string in the fourth quadrant and the character string in the second quadrant are respectively overlapped. Avoid the overlapping of character strings by making corrections. In the character string display frame determination step 9, the area occupied by the pie chart is calculated as follows.

It is assumed that the graph display device has a width of X _h and a width of Y _h . At this time, in the character strings M ₍₁₎ to M _(n) , the maximum values of the x coordinate and the y coordinate are respectively Max.
Let Mx and MaxMy be the minimum values MinMx and
If MinMy, in the case of X _h <MaxMx-MinMx + _H or Y _h <MaxMy-MinMy + _H determines the graph exceeds display frame.
In the reduction rate calculation step 10, the minimum required reduction rate of the pie chart is defined as x direction Sx and y direction Sy based on the information of the character string display frame determination step 9,

[0038]

Then, the larger value of Sx and Sy is set as the reduction ratio S, and the character string display position calculated in the character string display height calculation step 4 and thereafter is multiplied again by this reduction ratio S to be calculated again. ..

[0040]

As described above, in the character string / leader line drawing method of the graph of the present invention, the writing position (display position) of the character string of each item of the graph is calculated before drawing, and the character strings are overlapped. In this case, one of the leader lines is extended to avoid overlapping of character strings. If another character string overlaps due to this avoidance, the same avoidance process is sequentially performed, and this is repeated until all character strings do not overlap in drawing, and the entire graph including the character string is displayed. When it is determined that the range exceeds the drawing area, the reduction ratio of the entire graph is calculated, the entire graph is reduced, and the graph is drawn in the drawing area so that the character strings surrounding the graph do not overlap. In addition to improving the visibility of the graph and drawing the graph in the restricted display frame, it is possible to prevent the item name display from protruding from the screen and improve the usability. is there.

[Brief description of drawings]

FIG. 1 is a flowchart of a pie chart creation operation process by a character string / leader line drawing method of a graph according to an embodiment of the present invention.

FIG. 2 is a diagram showing a drawing area according to the method of FIG.

FIG. 3 is a diagram showing a general form of drawing by the method of FIG.

FIG. 4 is a diagram showing an example of drawing by the method of FIG.

FIG. 5 is a diagram showing a drawing example of a character string / leader line drawing method of a graph of a conventional example.

Claims (4)

[Claims] 1. A graph character in which a character string consisting of an item name, a numerical value, a symbol, etc. corresponding to each item is entered near each item of the graph, and each item of the graph and each character string are connected by a leader line. In the column writing method, a writing position of each character string is calculated, and when it is determined that two character strings overlap, one writing position is shifted, and a character string / leader line drawing method of a graph. 2. The character string / leader line drawing method for a graph according to claim 1, wherein in the case of a pie chart, a point on the bisector of the angle occupied by each item of the pie chart is a leader line start point and the leader line. A point that is a certain distance from the start point to the outside of the radial circle is defined as a temporary leader line, and a straight line that connects the leader line start point and the temporary leader line end point is defined as a temporary leader line. Calculating the angle from the pie chart base line to calculate the coordinate position of the temporary end point of the leader line,
If two adjacent character strings starting from this point do not overlap with each other, the coordinate position is used as the leader line end point, and when it is determined that they overlap with each other, one of the characters determined by the quadrant in which the two character strings are placed A character string / leader line drawing method for a graph, characterized in that a coordinate position of a starting point of a column is corrected and a line and a character line are drawn by using the corrected coordinate position as a leader line end point. 3. The character string / leader line drawing method for a graph according to claim 2, wherein the position where one of the two character strings is arranged is corrected so that the corrected character string is further improved. When it is determined that the character string is overlapped with another character string, the character string display position is corrected by further correcting the display position of the overlapped character string. Row
Drawing line drawing method. 4. It is determined whether or not a graph including a character string exceeds a displayable screen drawing area, and if it is determined that the entire graph including the character string exceeds the display device screen drawing area, the character string is Calculates the reduction ratio for reducing the entire graph including the size to a size that can be displayed in the drawing area of the display device screen, and multiplies the reduction ratio to all the display position coordinates of the graph to be reduced and displays a new display. A character string / leader line drawing method for a graph, which is characterized by drawing a leader line and a character string after obtaining the position.